Solve the problem.The radiator in a certain make of car needs to contain 
of 40% antifreeze. The radiator now contains 
of 20% antifreeze. How many liters of this solution must be drained and replaced with 100% antifreeze to get the desired strength?
A. 28 L
B. 17.5 L
C. 23.3 L
D. 35 L
Answer: B
Mathematics
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Rationalize the denominator and simplify. Assume that variables represent positive values.
A. 
B. 
C. 
D. 
Mathematics
Add.
A. 76.977 B. 77.977 C. 78.077 D. 77.077
Mathematics
Establish the identity.
= 
What will be an ideal response?
Mathematics
Determine whether a linear or quadratic function would be a more appropriate model for the graphed data. If linear, tell whether the slope should be positive or negative. If quadratic, decide whether the coefficient 
of x2 should be positive or negative. DENTAL FLOSS USE 
Years since 1990
A. Linear; positive B. Quadratic; positive C. Linear; negative D. Quadratic; negative
Mathematics